One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,15)(14,16)(17,18,23,27,22,20,19,24)(21,28,29,31,30,25,26,32)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,22,23)(18,24,20,27)(21,29,30,26)(25,32,28,31)(10,13)(14,16)(17,20,22,18)(19,24,23,27)(21,28,30,25)(26,31,29,32)(9,11,12,15)(10,14,13,16)(17,21,22,30)(18,25,20,28)(19,26,23,29)(24,31,27,32)(1,3,4,7)(2,6,5,8)(21,30)(25,28)(26,29)(31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.